This project show how to dynamically load SO file(same as Java dynamical load class file)

dlopen will load so file see the load_so.c

dlsym will get function pointer for symbol based on the function name you already know it. see the load_so.c

when get function pointer we can invoke it immediately like : (*demo_function)(1);

Then close load so moduel.

We can use this way to update program without stop applicaiton.